Python while loop conversion to Javascript

How would I convert the following:

while True:
    # do something
    time.sleep(2)

into JavaScript?

Answers:

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Method 1

You would not, as JavaScript does not sleep – it is synchronous and event-based. Yet, you can schedule functions to be executed later in time via setTimeout and setInterval:

var timerid = setInterval(function() {
    // do something
    // instead of "break", you'd use "clearTimeout(timerid)"
}, 2000);

For your ajax progress bar, I’d recommend the following which does not fire requests strictly each 2s, but waits for them to return:

function getUpdate() {
    myAjax(…, function onAjaxSuccess(result) { // an async event as well
        // show(result)
        if (!result.end)
            setTimeout(getUpdate, 2000);
    });
}
getUpdate();

Method 2

setInterval(function() {
  console.log('do something');
}, 2000);

http://jsfiddle.net/rS9bH/

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0